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\bibitem{Alfeld_etal2017} {\textquotedblleft}\textit{Simplex Volume Maximization (SiVM): a matrix factorization algorithm with non-negative constrains and low computing demands for the interpretation of full spectral X-ray fluorescence imaging data}{\textquotedblright}. Alfeld M, Wahabzada M, Bauckhage C, Kersting K, van der Snickt G, Noble P, Janssens K, Wellenreuther G, Falkenberg G, Microchemical journal \textbf{132}, 179 (2017).   http://doi.org/10.1016/J.MICROC.2017.02.001

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